There has long been an unfortunate confusion between making distinctions of phylum and performing science. Science, of course, is the practice of determining natural laws via testable, falsifiable hypotheses. Science says that a bear has x number of chromosomes.
Making phylum, on the other hand, is a means of characterizing and speaking about our discoveries. It does not discriminate between true and false, testable or not testable, and falsifiable or not falsifiable, it merely shows that a distinction is conceivable. Thus the phylum "bear" is distinguished from others by a set of common characteristics not shared by outsiders. In turn, differences between individuals in the phylum "bear" are conceptually deemphasized.